How severe is CVE-2026-11604?

CVE-2026-11604 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-11604 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-11604?

CVE-2026-11604 affects Openvpn Ovpn-dco-win. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-11604?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-11604 have an EU (EUVD) identifier?

Yes. CVE-2026-11604 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36151.

When was CVE-2026-11604 published?

CVE-2026-11604 was published on 2026-06-10 and last updated on 2026-09-24.

CVE-2026-11604

CVE-2026-11604 is a medium-severity vulnerability in Openvpn Ovpn-dco-win with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 5.6
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36151
Weakness: CWE-122
Affected product: Openvpn Ovpn-dco-win
Published: 2026-06-10
Last modified: 2026-09-24

Description

An incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win version 2.0.0 through 2.8.3 allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted data packet, resulting in a system crash (denial of service).

Frequently asked questions

What is CVE-2026-11604?: An incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win version 2.0.0 through 2.8.3 allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted data packet, resulting in a system crash (denial of service).
How severe is CVE-2026-11604?: CVE-2026-11604 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-11604 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-11604?: CVE-2026-11604 affects Openvpn Ovpn-dco-win. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-11604?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-11604 have an EU (EUVD) identifier?: Yes. CVE-2026-11604 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36151.
When was CVE-2026-11604 published?: CVE-2026-11604 was published on 2026-06-10 and last updated on 2026-09-24.

References

Affected products (1)

cpe:2.3:a:openvpn:ovpn-dco-win:*:*:*:*:*:*:*:*

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